diff --git a/computerScience/operatingSystems/memoryManagementBasicNotes.md b/computerScience/operatingSystems/memoryManagementBasicNotes.md
index 9dfc7671ff..d9cb3c23e5 100644
--- a/computerScience/operatingSystems/memoryManagementBasicNotes.md
+++ b/computerScience/operatingSystems/memoryManagementBasicNotes.md
@@ -9,3 +9,11 @@ check usage of virtual memory and swap region
 ```sh
 $ vmstat 2
 ```
+
+### pmap
+
+check detailed usage of memory
+
+```sh
+$ pmap PID
+```
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