diff --git a/README.md b/README.md
index c7e62d4..79ca75c 100644
--- a/README.md
+++ b/README.md
@@ -36,4 +36,10 @@ env_set CFLAGS -std=c17 -pedantic -Wall -Wextra
 env_set DEBUG_FLAGS -g3 -O0
 env_set RELEASE_FLAGS -O2 -DNDEBUG
 env_set LIBS -lm
-```
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+```
+
+**Tips**
+1: If you update a .h file you MUST do a `make clean` before building again otherwise the header changes will not be used.
+
+
+2: if you remove a .c file, you MUST do a `make clean` or manually remove .o files, otherwise they will never be wiped (even if they are no longer linked, it will just waste some disk-space)
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