diff --git a/README.md b/README.md
index 63e40c1..ae43b21 100644
--- a/README.md
+++ b/README.md
@@ -166,3 +166,8 @@ Which can be saved or displayed:
 
     im.save(...)
     im.show()
+
+# Usage from C
+
+This plugin can also be called from a regular C program.  For an example, look at:
+[src/test_j2k.c](https://github.com/Blosc/blosc2_openhtj2k/blob/main/src/test_j2k.c)
\ No newline at end of file
diff --git a/src/test_j2k.c b/src/test_j2k.c
index 45d8eaa..9ca0e8c 100644
--- a/src/test_j2k.c
+++ b/src/test_j2k.c
@@ -8,11 +8,7 @@
     See LICENSE.txt for details about copyright and rights to use.
 
     Test program demonstrating use of the Blosc filter from C code.
-    To compile this program:
-
-    $ gcc -O test_j2k.c -o test_j2k -lblosc2
-
-    To run:
+    Compile this program with cmake and run:
 
     $ ./test_j2k
     Read    OK