diff --git a/letta/prompts/prompt_generator.py b/letta/prompts/prompt_generator.py
index 90c4a665..ab8e7208 100644
--- a/letta/prompts/prompt_generator.py
+++ b/letta/prompts/prompt_generator.py
@@ -32,7 +32,7 @@ class PromptGenerator:
         is available through its tools.
 
         Args:
-            memory_edit_timestamp: When memory blocks were last modified
+            memory_edit_timestamp: When the system prompt was last recompiled
             timezone: The timezone to use for formatting timestamps (e.g., 'America/Los_Angeles')
             previous_message_count: Number of messages in recall memory (conversation history)
             archival_memory_size: Number of items in archival memory (long-term storage)
@@ -44,7 +44,7 @@ class PromptGenerator:
         Example Output:
             <memory_metadata>
             - The current time is: 2024-01-15 10:30 AM PST
-            - Memory blocks were last modified: 2024-01-15 09:00 AM PST
+            - System prompt last recompiled: 2024-01-15 09:00 AM PST
             - 42 previous messages between you and the user are stored in recall memory (use tools to access them)
             - 156 total memories you created are stored in archival memory (use tools to access them)
             - Available archival memory tags: project_x, meeting_notes, research, ideas
@@ -57,7 +57,7 @@ class PromptGenerator:
         metadata_lines = [
             "<memory_metadata>",
             f"- The current system date is: {get_local_time_fast(timezone)}",
-            f"- Memory blocks were last modified: {timestamp_str}",
+            f"- System prompt last recompiled: {timestamp_str}",
             f"- {previous_message_count} previous messages between you and the user are stored in recall memory (use tools to access them)",
         ]
 
diff --git a/tests/test_prompt_caching.py b/tests/test_prompt_caching.py
index 9f5ac8ab..01b3fc95 100644
--- a/tests/test_prompt_caching.py
+++ b/tests/test_prompt_caching.py
@@ -682,7 +682,7 @@ async def test_anthropic_system_prompt_stability(async_client: AsyncLetta):
             logger.info(diff_output[:2000])  # Truncate if too long
             logger.info("=" * 80)
 
-            if "Memory blocks were last modified" in diff_output:
+            if "System prompt last recompiled" in diff_output:
                 logger.error("⚠️  TIMESTAMP IS CHANGING IN ACTUAL REQUESTS!")
                 logger.error("   → This is the root cause of cache misses")
 
@@ -1054,7 +1054,7 @@ async def test_gemini_request_prefix_stability(async_client: AsyncLetta):
                 lineterm="",
             )
             diff_output = "\n".join(diff)
-            if "Memory blocks were last modified" in diff_output or "timestamp" in diff_output.lower():
+            if "System prompt last recompiled" in diff_output or "timestamp" in diff_output.lower():
                 logger.error("⚠️  TIMESTAMP IN SYSTEM INSTRUCTION IS CHANGING!")
                 logger.error("   → This breaks Gemini implicit caching (prefix must match)")
         else: