diff --git a/contracts/lib/RLPReader.sol b/contracts/lib/RLPReader.sol
index 70db5a5..a78bc84 100644
--- a/contracts/lib/RLPReader.sol
+++ b/contracts/lib/RLPReader.sol
@@ -211,7 +211,7 @@ library RLPReader {
         assembly {
             result := mload(memPtr)
 
-            // shift to the correct location if neccesary
+            // shift to the correct location if necessary
             if lt(len, 32) {
                 result := div(result, exp(256, sub(32, len)))
             }
diff --git a/contracts/light-client-others/bsc-tendermint/lib/proto/ProtoBufRuntime.sol b/contracts/light-client-others/bsc-tendermint/lib/proto/ProtoBufRuntime.sol
index 89cb8a4..e620a49 100644
--- a/contracts/light-client-others/bsc-tendermint/lib/proto/ProtoBufRuntime.sol
+++ b/contracts/light-client-others/bsc-tendermint/lib/proto/ProtoBufRuntime.sol
@@ -1785,7 +1785,7 @@ library ProtoBufRuntime {
 
     /**
      * @dev Encode Solidity type
-     * @param x The unsinged integer to be encoded
+     * @param x The unsigned integer to be encoded
      * @param sz The number of bytes used to encode Solidity types
      * @param p The offset of bytes array `bs`
      * @param bs The bytes array to encode