diff --git a/.gemini/GEMINI.md b/.gemini/GEMINI.md
index ec79ac9..8f68a6b 100644
--- a/.gemini/GEMINI.md
+++ b/.gemini/GEMINI.md
@@ -82,6 +82,7 @@ Always respond in Markdown. Use headings, lists, and bold text for clarity.
         - **Action:** Finds the latest raw class note in `10-Input/Classes/` that does not contain `processed: true` in its frontmatter.
         - **Action:** Extracts knowledge sections (e.g., "Random Words," "Main Point").
         - **Action:** Intelligently merges this knowledge into the corresponding `20-Knowledge/Synthesized-[Language]-Class-Notes.md` file, organizing by topic. New entries are added under existing topic headings, and new topics get new headings. A date stamp in the format `- YYYY-MM-DD:` is added next to each new heading for tracking.
+        - **Action (Priority):** Anything listed under a **# Main Point** heading is treated as high-priority permanent knowledge. All detailed explanations, nuances, and examples within this section MUST be preserved in full during synthesis.
         - **Action:** Extracts the "Homework" section and overwrites the `10-Input/Classes/[Language]_Homework.md` file.
         - **Action:** Creates a brief synopsis of the processed note's key topics, prepends it to the `[Language]_Homework.md` file, and then deletes any standalone synopsis file that was created.
         - **Action:** Adds `processed: true` to the YAML frontmatter of the source note to prevent re-processing.
@@ -133,6 +134,7 @@ Always respond in Markdown. Use headings, lists, and bold text for clarity.
         - **Action:** Finds the latest raw class note in `10-Input/Classes/` that does not contain `processed: true` in its frontmatter.
         - **Action:** Extracts knowledge sections (e.g., "Random Words," "Main Point").
         - **Action:** Intelligently merges this knowledge into the corresponding `20-Knowledge/Synthesized-[Language]-Class-Notes.md` file, organizing by topic. New entries are added under existing topic headings, and new topics get new headings. A date stamp in the format `- YYYY-MM-DD:` is added next to each new heading for tracking.
+        - **Action (Priority):** Anything listed under a **# Main Point** heading is treated as high-priority permanent knowledge. All detailed explanations, nuances, and examples within this section MUST be preserved in full during synthesis.
         - **Action:** Extracts the "Homework" section and overwrites the `10-Input/Classes/[Language]_Homework.md` file.
         - **Action:** Creates a brief synopsis of the processed note's key topics, prepends it to the `[Language]_Homework.md` file, and then deletes any standalone synopsis file that was created.
         - **Action:** Adds `processed: true` to the YAML frontmatter of the source note to prevent re-processing.
diff --git a/00-Meta/GEMINI.md b/00-Meta/GEMINI.md
index ec79ac9..8f68a6b 100644
--- a/00-Meta/GEMINI.md
+++ b/00-Meta/GEMINI.md
@@ -82,6 +82,7 @@ Always respond in Markdown. Use headings, lists, and bold text for clarity.
         - **Action:** Finds the latest raw class note in `10-Input/Classes/` that does not contain `processed: true` in its frontmatter.
         - **Action:** Extracts knowledge sections (e.g., "Random Words," "Main Point").
         - **Action:** Intelligently merges this knowledge into the corresponding `20-Knowledge/Synthesized-[Language]-Class-Notes.md` file, organizing by topic. New entries are added under existing topic headings, and new topics get new headings. A date stamp in the format `- YYYY-MM-DD:` is added next to each new heading for tracking.
+        - **Action (Priority):** Anything listed under a **# Main Point** heading is treated as high-priority permanent knowledge. All detailed explanations, nuances, and examples within this section MUST be preserved in full during synthesis.
         - **Action:** Extracts the "Homework" section and overwrites the `10-Input/Classes/[Language]_Homework.md` file.
         - **Action:** Creates a brief synopsis of the processed note's key topics, prepends it to the `[Language]_Homework.md` file, and then deletes any standalone synopsis file that was created.
         - **Action:** Adds `processed: true` to the YAML frontmatter of the source note to prevent re-processing.
@@ -133,6 +134,7 @@ Always respond in Markdown. Use headings, lists, and bold text for clarity.
         - **Action:** Finds the latest raw class note in `10-Input/Classes/` that does not contain `processed: true` in its frontmatter.
         - **Action:** Extracts knowledge sections (e.g., "Random Words," "Main Point").
         - **Action:** Intelligently merges this knowledge into the corresponding `20-Knowledge/Synthesized-[Language]-Class-Notes.md` file, organizing by topic. New entries are added under existing topic headings, and new topics get new headings. A date stamp in the format `- YYYY-MM-DD:` is added next to each new heading for tracking.
+        - **Action (Priority):** Anything listed under a **# Main Point** heading is treated as high-priority permanent knowledge. All detailed explanations, nuances, and examples within this section MUST be preserved in full during synthesis.
         - **Action:** Extracts the "Homework" section and overwrites the `10-Input/Classes/[Language]_Homework.md` file.
         - **Action:** Creates a brief synopsis of the processed note's key topics, prepends it to the `[Language]_Homework.md` file, and then deletes any standalone synopsis file that was created.
         - **Action:** Adds `processed: true` to the YAML frontmatter of the source note to prevent re-processing.
diff --git a/20-Knowledge/Synthesized-Japanese-Class-Notes.md b/20-Knowledge/Synthesized-Japanese-Class-Notes.md
index fda7cec..4e72cab 100644
--- a/20-Knowledge/Synthesized-Japanese-Class-Notes.md
+++ b/20-Knowledge/Synthesized-Japanese-Class-Notes.md
@@ -198,8 +198,24 @@ This is a fundamental concept in Japanese grammar that distinguishes between ver
 
 - **Expressing Preparation (ておく)**: Indicates something was done in preparation.
 
-- **Expressing "I'm glad that..." (よかったです)**: Conjugate a verb into て form and add よかったです. For negative verbs, use 〜ないで instead of なくて.
-    - *Example: 君と知り合っておいてよかったです (I’m glad that I got to know you.)*
+- **Expressing "I'm glad that..." (よかったです)**: Conjugate a verb into て form and add よかったです. For negative verbs (not go, not do, not eat, etc.), use **〜ないで**, not なくて.
+
+    #### Integration with 〜ておく (Preparation/Proactivity)
+    Often used as **〜ておいてよかったです**. Using おいて adds layers of:
+    - **Proactivity**: You made the effort or "settled" the action.
+    - **Future Benefit**: It was a "good move" that is paying off now or later.
+    - **Completeness**: A "box" has been checked that improves the current situation.
+    - *Example: 君と知り合っておいてよかったです (I’m glad that I (went ahead and) got to know you.)*
+
+    #### Examples:
+    - 見つかってよかったです (I'm glad I found it)
+    - 勉強してよかったです (I'm glad I studied)
+    - 日本語を習ってよかったです (I'm glad I learned Japanese)
+    - 聖書を読んでおいてよかったです (I'm glad that I read the bible)
+    - 君と知り合っておいてよかったです (It was nice to get to know you)
+    - 引っ越してよかったです (I'm glad I moved)
+    - 晴れてよかったです (I'm glad it was sunny)
+    - いかないでおいてよかったです (I'm glad I didn't go.)
 
 - **"Makes Sense" (筋が通っている)**: LIT: "It follows a thread." Used to say something is logically consistent.
     - *Other common expressions*: なるほど (I see), 確かに (That's true).