diff --git a/src/crypto/CHIPCryptoPAL.h b/src/crypto/CHIPCryptoPAL.h
index 4b77523a3e0b2a..7a5cb1f191d706 100644
--- a/src/crypto/CHIPCryptoPAL.h
+++ b/src/crypto/CHIPCryptoPAL.h
@@ -228,6 +228,12 @@ class ECPKey
                                                      const Sig & signature) const                                              = 0;
 };
 
+/**
+ * @brief Helper class for holding sensitive data that should be erased from memory after use.
+ *
+ * The sensitive data buffer is a variable-length, fixed-capacity buffer class that securely erases
+ * the contents of a buffer when the buffer is destroyed.
+ */
 template <size_t kCapacity>
 class SensitiveDataBuffer
 {
@@ -291,6 +297,12 @@ class SensitiveDataBuffer
     size_t mLength = 0;
 };
 
+/**
+ * @brief Helper class for holding fixed-sized sensitive data that should be erased from memory after use.
+ *
+ * The sensitive data buffer is a fixed-length, fixed-capacity buffer class that securely erases
+ * the contents of a buffer when the buffer is destroyed.
+ */
 template <size_t kCapacity>
 class SensitiveDataFixedBuffer
 {