diff --git a/include/rapidjson/internal/dtoa.h b/include/rapidjson/internal/dtoa.h
index 9645e9b..289a224 100644
--- a/include/rapidjson/internal/dtoa.h
+++ b/include/rapidjson/internal/dtoa.h
@@ -45,7 +45,7 @@ RAPIDJSON_DIAG_OFF(effc++)
 struct DiyFp {
     DiyFp() {}
 
-    DiyFp(uint64_t f, int e) : f(f), e(e) {}
+    DiyFp(uint64_t fp, int exp) : f(fp), e(exp) {}
 
     DiyFp(double d) {
         union {
diff --git a/include/rapidjson/writer.h b/include/rapidjson/writer.h
index fdade6e..02d6680 100644
--- a/include/rapidjson/writer.h
+++ b/include/rapidjson/writer.h
@@ -59,12 +59,14 @@ public:
 
     //! Constructor
     /*! \param os Output stream.
-        \param allocator User supplied allocator. If it is null, it will create a private one.
+        \param stackAllocator User supplied allocator. If it is null, it will create a private one.
         \param levelDepth Initial capacity of stack.
     */
+    explicit
     Writer(OutputStream& os, StackAllocator* stackAllocator = 0, size_t levelDepth = kDefaultLevelDepth) : 
         os_(&os), level_stack_(stackAllocator, levelDepth * sizeof(Level)), hasRoot_(false) {}
 
+    explicit
     Writer(StackAllocator* allocator = 0, size_t levelDepth = kDefaultLevelDepth) :
         os_(0), level_stack_(allocator, levelDepth * sizeof(Level)), hasRoot_(false) {}