diff --git a/appdx-bitcore.asciidoc b/appdx-bitcore.asciidoc
index d2f22015..b187c388 100644
--- a/appdx-bitcore.asciidoc
+++ b/appdx-bitcore.asciidoc
@@ -23,7 +23,7 @@
 
 === Bitcore Library Examples
 
-==== Prerequisities
+==== Prerequisites
 
 * NodeJS >= 4.x or use our https://bitcore.io/playground[hosted online playground]
 
diff --git a/appdx-pycoin.asciidoc b/appdx-pycoin.asciidoc
index f4c1fbee..9d877000 100644
--- a/appdx-pycoin.asciidoc
+++ b/appdx-pycoin.asciidoc
@@ -388,7 +388,7 @@ The final line appears because to validate the transactions' signatures, you tec
 ----
 $ tx -a 49d2adb6e476fa46d8357babf78b1b501fd39e177ac7833124b3f67b17c40c2a
 warning: transaction fees recommendations casually calculated and estimates may be incorrect
-warning: transaction fee lower than (casually calculated) expected value of 0.1 mBTC, transaction might not propogate
+warning: transaction fee lower than (casually calculated) expected value of 0.1 mBTC, transaction might not propagate
 Version:  1  tx hash 49d2adb6e476fa46d8357babf78b1b501fd39e177ac7833124b3f67b17c40c2a  159 bytes
 TxIn count: 1; TxOut count: 1
 Lock time: 0 (valid anytime)
diff --git a/ch07.asciidoc b/ch07.asciidoc
index 04483909..f207b749 100644
--- a/ch07.asciidoc
+++ b/ch07.asciidoc
@@ -948,7 +948,7 @@ The native segwit address format is defined in BIP-173:
 
 https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki[BIP-173]:: Base32 address format for native v0-16 witness outputs
 
-BIP-173 only encodes witness (P2WPKH and P2WSH) scripts. It is not compatible with non-segwit P2PKH or P2SH scripts. BIP-173 is a checksummed Base32 encoding, as compared to the Base58 encoding of a "traditional" bitcoin address. BIP-173 addesses are also called _bech32_ addresses, pronounced "beh-ch thirty two", alluding to the use of a "BCH" error detection algorithm and 32-character encoding set.
+BIP-173 only encodes witness (P2WPKH and P2WSH) scripts. It is not compatible with non-segwit P2PKH or P2SH scripts. BIP-173 is a checksummed Base32 encoding, as compared to the Base58 encoding of a "traditional" bitcoin address. BIP-173 addresses are also called _bech32_ addresses, pronounced "beh-ch thirty two", alluding to the use of a "BCH" error detection algorithm and 32-character encoding set.
 
 BIP-173 addresses use 32 lower-case-only alphanumeric character set, carefully selected to reduce errors from misreading or mistyping. By choosing a lower-case-only character set, bech32 is easier to read, speak, and 45% more efficient to encode in QR codes.